| 摘要 |
In large PV power plants, grounding of individual PV modules may lead to problems. The present invention overcomes such problems. The PV power plant (34) comprises an offset voltage source (14), wich controls the DC potential at the AC outputs (19). Thereby, the DC potential at the DC input will be indirectly controlled, and it is thus possible to ensure that the potentials with respect to ground (15) at the terminals of PV modules (5) are all non-negative or all non-positive without grounding the PV modules. Ground loops can be avoided, and there is no need for the use of transformer-based inverters (4). |
